Codemod act -> await act (4/?)

Similar to the rationale for `waitFor` (see facebook#26285), we should always
await the result of an `act` call so that microtasks have a chance to
fire.

This only affects the internal `act` that we use in our repo, for now.
In the public `act` API, we don't yet require this; however, we
effectively will for any update that triggers suspense once `use` lands.
So we likely will start warning in an upcoming minor.

packages/react-reconciler/src/__tests__/ReactOffscreenStrictMode-test.js

@@ -32,8 +32,8 @@ describe('ReactOffscreenStrictMode', () => {
  }
 
  // @gate __DEV__ && enableOffscreen
- it('should trigger strict effects when offscreen is visible', () => {
- act(() => {
+ it('should trigger strict effects when offscreen is visible', async () => {
+ await act(async () => {
  ReactNoop.render(
  <React.StrictMode>
  <Offscreen mode="visible">
@@ -56,8 +56,8 @@ describe('ReactOffscreenStrictMode', () => {
  });
 
  // @gate __DEV__ && enableOffscreen && useModernStrictMode
- it('should not trigger strict effects when offscreen is hidden', () => {
- act(() => {
+ it('should not trigger strict effects when offscreen is hidden', async () => {
+ await act(async () => {
  ReactNoop.render(
  <React.StrictMode>
  <Offscreen mode="hidden">
@@ -71,7 +71,7 @@ describe('ReactOffscreenStrictMode', () => {
 
  log = [];
 
- act(() => {
+ await act(async () => {
  ReactNoop.render(
  <React.StrictMode>
  <Offscreen mode="hidden">
@@ -86,7 +86,7 @@ describe('ReactOffscreenStrictMode', () => {
 
  log = [];
 
- act(() => {
+ await act(async () => {
  ReactNoop.render(
  <React.StrictMode>
  <Offscreen mode="visible">
@@ -109,7 +109,7 @@ describe('ReactOffscreenStrictMode', () => {
 
  log = [];
 
- act(() => {
+ await act(async () => {
  ReactNoop.render(
  <React.StrictMode>
  <Offscreen mode="hidden">
@@ -127,7 +127,7 @@ describe('ReactOffscreenStrictMode', () => {
  ]);
  });
 
- it('should not cause infinite render loop when StrictMode is used with Suspense and synchronous set states', () => {
+ it('should not cause infinite render loop when StrictMode is used with Suspense and synchronous set states', async () => {
  // This is a regression test, see https:/facebook/react/pull/25179 for more details.
  function App() {
  const [state, setState] = React.useState(false);
@@ -143,7 +143,7 @@ describe('ReactOffscreenStrictMode', () => {
  return state;
  }
 
- act(() => {
+ await act(async () => {
  ReactNoop.render(
  <React.StrictMode>
  <React.Suspense>
@@ -193,7 +193,7 @@ describe('ReactOffscreenStrictMode', () => {
  return null;
  }
 
- act(() => {
+ await act(async () => {
  ReactNoop.render(
  <React.StrictMode>
  <Offscreen mode="visible">